3x+15=-6

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Solution for 3x+15=-6 equation: 


Simplifying
3x + 15 = -6

Reorder the terms:
15 + 3x = -6

Solving
15 + 3x = -6

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-15' to each side of the equation.
15 + -15 + 3x = -6 + -15

Combine like terms: 15 + -15 = 0
0 + 3x = -6 + -15
3x = -6 + -15

Combine like terms: -6 + -15 = -21
3x = -21

Divide each side by '3'.
x = -7

Simplifying
x = -7

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